Since we've upgraded the community to 4.5, you may have noticed you get a weekly digest email. If you are on the "admin" email list, you've CERTAINLY noticed, as each Thursday we get 1,000+ messages.
Its an OK feature, but I think it needs to be opt-in only. Since the product doesn't give us that option, I'm disabling it now.
The only other option is to run a custom build of SBS, but I'm not fond of managing that process if people are just as happy to not have the emails.